Amount by which current fair value of underlying stock exceeds exercise price of exercised options.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Share-Based Payment Plans - Additional disclosures (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested options	$ 468			$ 468
Intrinsic value of outstanding options	3,300			3,300
Intrinsic value of exercisable options	2,700			2,700
Proceeds from options exercised		$ 290		290	$ 50
Intrinsic value of options exercised	$ 0	$ 878		0
Tax benefit of options exercised				$ (77)
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options issued	0		0	0	0
Contractual term of awards				10 years
Stock options expense	$ 131			$ 263	$ 264
Recognition period of nonvested stock options				1 year 3 months 29 days
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				6 years
Stock options expense	256		$ 139	$ 512	$ 276
Unrecognized compensation cost related to non-vested options	$ 4,900			$ 4,900
Recognition period of nonvested stock options				4 years 10 months 9 days